Half to heney s



UNITED STATESy PATET OFFICE.

EDWARD A. LEARN ED, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE- HALFTO HENRY S. DURDEN AND HERMAN L. WELCH, OF SAME PLACE.

BUCK-SAW.

SPECIFICATION forming part of Letters Patent No. 227,141, dated May 8,1883.

Application filed September 18, 1882. (No model.)

To all whom it may concern Be it known that I, EDWARD A. LEARNED, of thecity and county of San'Francisco, State of California, have invented anImprovementin Buck-Saws; and I hereby declare the following to be afull, clear, and exact description thereof.

My invention relates to certain improvements in saws .of that classknown as bucksaws,77 and in which thetension of the saw is maintained bythe constant action of a springframe,orofanyspringattachment.Inthisclass of saws it is extremely difficult to force the end framestogether and hold them while the pin ordinarily used is being, putthrough the' frame and saw to hold the latter in place. My invention isdesigned to obviate this difculty by the use of a spring latch orlatches which open to admit the end of the saw-blade, and then engagewith suitable Vnotches therein, so as to bold the saw firmly when thestrain' is again brought upon it.

Referring to the accompanying drawings for a more complete explanationof my invention, Figure l is a view of my saw. Fig. 2 is an enlargeddetail view.

A B are the end pieces of a saw-frame, which in the present case areshown to be made of wood, having a curved uniting-spring, C, at the top,which is clamped to the upper ends of the frames, so as to hold them inplace. This spring separates the lower ends of the frames to such adistance that they must be forced together to connect them with the endsof the saw-blade. The usual slots are made in the two end frames toreceive the ends of the saw-blade D. The blade may be secured to theouter or back frame, B, by a pin in the usual manner. The end whichenters the slot in the handle A has notches E E cut in each edge, nearthe end, and these notches are so formed as to engage and hold thehooked ends of the latches F. These latches are pivoted in the frame,preferably one near each edge of the saw, and may have extensions G,which project beyond the frame A and serve as levers by which thelatches are separated when desired by compressing these ends together.The levers are separated and the latches are drawn together by means ofsprings H, set in the frame or in other suitable position.

rIhe operation of securing the saw-blade will be as follows:Afterthespring-frame is in readiness the back end ofthe saw is securedin the end piece, B, by the pin, and the end frames are forced towardeach other in any convenient manner, usually by pressing upon the handlewhile the lower end ofB rests upon the ground. When the handle A hasthus been brought near enough, the end ofthesaw-blade is guided 6o intoits slot and passes between the springlatches until they catch into thenotches formed in the edges of the blade, and thus hold it rmly inplace. When the pressure is released, the tension of the spring isextended upon the saw in the usual manner. When the saw-blade is to bereleased, it is done by. press ing the levers G between the thumb andiinger after the frames A and B have been forced toward each othersufcientl y to overcome the 7o ,a

tension of the back spring and release the saw.

For the purpose of preventing the latches F from disengaging with thenotches E at any sudden jar the saw receives, I form in the face of saidnotches a spur or projection, as seen more particularly in Fig. 2, whichwill sink slightly into the face of the latch and prevent slippingexcept when considerable force is applied to the outer ends. y

Having thus described my invention, what I 8o claim as new, and desireto secure by Letters Patent, is-

l. The frame A B and thespring-back C, counectingsaid frame,incombination with the sawblade D, attached at one end to the frame B,

and having the notches E formed on its edges,

and the spring-latches F, pivoted in the frame A, and provided withdisengaging-levers Gr,

substantially as set forth. f

2. The connected frame A B, in combina- 9o tion with the saw-blade D,attached at one end to the frame B, and having the notches E formed onits edges, with projections or spurs e on their faces, and the springnotched latches F, substantially as and for the purpose herein shown anddescribed. Y

In witness whereofI hereunto set my hand.

EDVARD A. LEARNED.

